racket specs old school vs modern

joe sch

joe sch

Legend
The old school rackets pretty much used a L, M, H, flexion, and torsion. Donnay even provided a nice matrix graph on the side of some of their models like the borg pro, and graphite, fiber, and flex pros. See:

http://s920.photobucket.com/albums/...y%20rackets/?action=view&current=IMG_1663.jpg

The modern specs are based on RDC like stats which are often summarized as:
Racquet Static weight (g/oz) / Flex / Swingweight. For example:

Head Prestige Classic 355/12.52/60/331

The modern stats are more precise but not sure why torsion is no longer specified ?
Is torsion basically the same as swing weight ?
 
I assume torsion would be some measure of stability.

Perhaps Donnay had some measure of that dynamic for their frames. These days there are computer measurement using accelerometers upon impact. The racket designers use them in their design of frames on impact. Seeing how the frames respond to being hit at different areas of the string bed.

In conjunction with swing weight, I think a nice measurement would be twistweight. I'm not sure if that would be the same as some sort of stability measurement that I'm assuming would be like the torsional one you show in your pic, but it's another measurement that could reflect stability and maneuverability of a tennis racket.
 
VGP said:
I assume torsion would be some measure of stability.

Perhaps Donnay had some measure of that dynamic for their frames. These days there are computer measurement using accelerometers upon impact. The racket designers use them in their design of frames on impact. Seeing how the frames respond to being hit at different areas of the string bed.

In conjunction with swing weight, I think a nice measurement would be twistweight. I'm not sure if that would be the same as some sort of stability measurement that I'm assuming would be like the torsional one you show in your pic, but it's another measurement that could reflect stability and maneuverability of a tennis racket.
Click to expand...

I believe you are correct in your line of reasoning.

VSBabolat recently offered this video which supports what you touched upon above:

You might enjoy this video:
http://www.youtube.com/headtennis#p/a/u/2/JMBqPbLrZMA
 
joe, thanks for the video link provided by vsbabolat.

It's a lot like a short video/commercial from Wilson that I saw on Tennis Channel from Wilson. Theirs was entitled "How Racquets are Born." It's very similar....

I know materials science goes way back. I'd love to see how things were done on frame torsion in the wood racket days.
 
wilson t2000 "r flex" and "firm flex" specs

joe sch
i saw in an earlier post where you asking about jimmy conners only using t2000's with the "r flex" rating. do you know anymore about that? i have one that is a "firm flex" how about that one too. are these different ratings?

coach rick
if i remember correctly you said that you strung for jimmy once do you remember anything like that?

jimbo 333
do you know anything about these flex ratings? i know you have a lot of these metal rackets.

thanks much for anyone else's help also.
 
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